Multiple-spindle drill-head.



F. W. & c. A. HO EFER. MULTIPLE SPINDLE DRILL HEAD.

APPLICATION FILED APR. 15. I914.

Patented Dec. 21, 1915.

'3 SHEETS-SHEET l.

, I INVENTORS a 7/4 W m WITNESSES: I L

COLUMBIA PLANOGRAPH COuWASHlNGTON, D. c.

F. W.'& C. A. HOEFER.

MULTIPLE .SPINDLE DRlLL' HEAD.

APPLICATION FILED APR. 15. IBM.

1,164,81 3. Patented Dec. 21, 1915.

3 SHEETS-SHEET 2.

IN VEN TORS WITNESSES: W

PH CID-.WASHINGTON D c M LW m ATTORNEY F. W. & C. A. HOEFER.

MULTIPLE SPINDLE DRILL HEAD.

APPLICATION FILED APR. 15, 1914.

1, 164,81 3. Patented Dec. 21, 1915.

3 SHEETS-SHEET 3- 2 II III W MIIVENTORS .4 m fi /1 TTORNEY COLUMBIAPMNOGnr-Pn co..wAsmNflTON D C FREDERICK W. HOEFER AND CHESTER A. HOEFER,F FREEPORT, ILLINOIS, ASSIGNORS TO HOEFER MANUFACTURING COMPANY, OFFREEPORT, ILLINOIS, A CORPORATION OF ILLINOIS.

MULTIPLE-SPINDLE DRILL-HEAD.

Specification of Letters Patent.

Patented Dec. 21, 1915.

Application filed April 15, 1914. Serial No. 831,893.

' tion belongs are designed to be attached to the spindle sleeve of asingle spindle drill press and to convert the same into a double spindledrill press, the two spindles of which are adjustable toward or fromeach other so as to bore two holes at once' at any desired distanceapart. In this art it is common to provide an extension of the drillpress spindle having a master gear fast thereon. a housing or casinghaving suitable bearings,

adjustable swinging armsvertically pivoted to the casing and carryingdrill spindles provided with driving pinions, and suitable gearingconnecting the master gear with the respective gears upon the drillspindles. The space which can be conveniently appropriated for theseauxiliary heads is necessarily limited, and in fact the more compactthey can be made the more convenient they become-and the wider the rangeof work to which they are adapted.

It is the purpose of this invention to so construct and arrange thevarious necessary elements of one of these devices as to provide astout, compact structure having the widest possible range of adjustmentwithin the least space that is confi'stent with strength andsatisfactory operation.

To such end the invention consists in various novel characteristics thatwill be fully brought out in the following description and the essentialportions of which will be definitely stated in the claims.

In these drawings Figure 1 is a front elevation of a complete head; Fig.2 is a top I plan of the same. showing the adjustable arms in one oftheir alternative positions by means of dotted lines; Fig. 3is avertical section in the line 3-3 of Fig. 2 looking in the direction ofthe arrow 3; Fig. 4 is an under plan of Fig. 1; Fig. 5 is an elevationof the lower portion of the cylindrical part of the case which clampsupon the spindle sleeve of the drill press, afiords a bearing for theextension of the drill spindle and also bears a reduced downwardextension to which the remaining portions of the casing are secured;Figs. 6, 7 and 8 are similar elevations of other portions of the casingwhich are secured to and relatively stationary with regard to saidcylindrical part; Figs. 9, l0 and 11 are top plans of said otherportions ofthe casing; Figs. 12 and 13 are elevations of the two partsof one of the swinging arms, carrying adjustable spindles, and Figs.land 15 are plan views of the same.

Referring to these drawings A is a cylindrical auxiliary sleeve splitupon the rear side at the top, a, and provided with a clamping screw, alby means of which it is intended to be firmly clamped upon the spin dlesleeve of the drill press. At the lower end is a reduced extension, (6adapted to enter and support the parts of the casing below the same. Theinterior of the cylindrical sleeve is bored to form a bearing for anextension of thedrill press spindle which is seen in Fig. 3 at a andupon the lower portion of which is the master gear Z of the head. In thecomplete device this master gear drives two loose gears upon oppositesides thereof of which one is shown at Y in Fig. 3 and as the two areprecisely similar in form and arrangement 'both need not be described indetail- These loose gears are in mesh withpinions X upon the adjustablespindles W. To provide a casing to accommodate these gears and in whichthey can be conveniently placed in assembling the device we constructthe same in three parts, of which the lower, B. Figs. 8 and 11, is ofirregular cup shape having a large bore, 6,

of proper size to receive the master gear, and,

two smaller bores, 6 corresponding in size to the loose gears Y. Thebottom plate of the cup is bored at b b b concentric with the largerbores to provide bearings for the lower end of the spindle extension andfor two pins or bolts upon which the loose gears are mounted. The cup Balso has four holes, Z)", 6 b and to receive I three perforations, d, d03 through which tension a of the cylindrical auxiliary sleeve A. Thepart C also has an upward exten sion, a, surrounding the bore 0 providedwith three screw threaded holes, 0 0 c. The lower plate portion has fourscrew threaded holes, 0 0 0 0 to receive the screws which enter throughthe perforations I), b, b ,-and b of the cup B.

A plate, D, Figs. 6 and 9, is fitted to the upper portion of theextension 0 and has bores 6 b of the cup B open into the bore Z) of thesame so that the gears for which these bores are provided may mesh withthe mastergear located in the bore 6. V

The swinging arms of the device are made up of two parts shown in Figs.12 to 15.

'able spindle, W, and is enlarged at e to A U shaped portion, E, has anupright part, e, furnishing a bearing, a, for an adjustaccommodate oneof the driving pinions thereof X. This enlarged portion 18 extendedlaterally at e and has a vertically bored recess e to fit over the upperend, A of the loose gear Y. The lower portion of the arm is alsoextended laterally at e andhas a perforation, efl'seen in Fig. 15,corresponding to perforations b of the part B and arranged contiguousthereto and to register therewith when the device is as sembled. Theother part, F, is in the form of a cap or cover for the enlargement eand its lateral extension and has an inverted cup shaped portion, f, toaccommodate a vertical thrust bearing which is seen at V in Fig. 3,concentric with which is a bore, P, which receives the upper end of theadjustable spindle W and affords a bearing therefor. A lateral platelike extension, f covers the extension of the swinging arm and isperforated at f to receive the upper end of a bolt, U, which alsoextends through the perforations, 6 Fig. 15, 6 Fig. 11, and 0Z Fig. 9.and is screw threaded in the last and furnishes the pivot upon which theI swinging arm is hinged.

The upper face of the swinging arm E is bored and threaded at 6 a eandvthe cap F is perforated at 7, f f to register therewith andaccommodate the screws by means of which the cap is secured to theswinging arm. a

In assembling the head the spindle extension with its master gear isplaced in p0- sition in thecup B, the lower end of the spindle extendingthrough the perforation b which affords a bearing therefor.v The part Gisslipped over the spindle extension, the perforation 0 receivingtheLlatter, and the two parts are. secured together by means of screwsin the holes provided therefor,

which have already been described and which bring the bores 0 0 intoregister with the'bor'es b 5 The part E of the swingingarm is thenslipped into'position with the hole 6 Fig. 15,;in line with the hole I),Fig-11, and the bore 6 Fig. 15, in

register with thebore 0 Fig. 10. The inter mediate gear Y is thendropped'into these two bores in mesh at its lower end with the mastergearand the adjustable spindle W with its pinion X and its thrustbearing V is inserted in the upright portion of the swingingvv arm. Thecap F is then placed upon the swinging arm and secured thereon by'meansof the screws in the screw holes already described. The plate D isnowfastened upon the part C by means of the screws provided therefor andthe bolt. W

inserted and screwed into position. The

reduced portion cf of the cylindrical auxiliary spindle sleeve Ais, nowforced down-v ward into the bores d 0 and secured therein by an ordinaryset screw, not shown in any of the figures. This completes the casingfor the working parts of the device .in exceedingly compact and durableform and at the same time affords an easymethfod of assembling andsecuring the parts together.

For the purpose of securely fastening the adjustable spindle in anydesired position we provide upon the bottom of the part B a plate, G,perforated at g, 9 to receive the lower ends of thescrew bolts U and bepositioned thereby'upon the bottom of the party B. Said plate isprovided with slots, g g arc shaped about these bolts and the lower endof the upright portion, 6, of the arm.

l3 has a downward extension, fe screw threaded, which extends throughthis slot and carries below the same a nut, H, which may be screwed upupon the plate to clamp the spindlein any desired position.

We realize thepossibility of moreor less variation in exact form,construction and arrangement of the various parts herein de,-'

scribed and therefore it'is notour intention to limit ourselves. to thespecific construction shown but in the following claims we will point'.out the characteristic features vwhich we consider essential to ourinvention and in these claims itvis our intention to cover all of thepatentable novelty contained in our invention overthe prior art., 2 Weclaim as newand desire to secure :by

Letters Patentzi 1 1. The combination with a main casing containing aspindle extension and a master 7 gear fast thereon, of asecond gearengaging arm-like casings above and overlapping the first casing andswinging about the axes of said duplicate gears, respectively, drillspindles mounted in the free ends of the armlike'caslngs, respectively,and gears lnclosed in the arm-like casings, respectively andtransmitting movement from the duplicate gears to the correspondingdrill spindles.

3. In a device of the class described a sleeve adapted to be clamped tothe spindle sleeve of a drill press, a casing upon the lower endthereof, a spindle extension journaled in said casing, a master gearfast on said extension and inclosed in said casing, a swinging armhingedto said casing, having a drill spindle journaled therein and adownward extension from the bottom thereof, a'pinion on said drillspindle, gearing between said pinion and said master gear arranged uponthe axis of the swinging arm,

a plate secured to the bottom of the casing and having a slot arc shapedabout the axis of said swinging arm to accommodate the extension uponthe bottom thereof and a nut screw threaded to said extension andadapted to be clamped upon said plate to secure said arm in any desiredadjustment.

le-The combination with a spindle extension having near its lower end afast gear, of two elongated secondary gears, at a suitable angulardistance apart, engaged with the gear first mentioned, a casingperipherally inclosing the first gear and the lower portion of bothsecondary gears, two armlike casings inclosing the upper ends,respectively, of the secondary gears, swinging about the axes of thelatter and overlapping the main casing, and drill spindles mounted inthe free end portions of said arm-like casings respectively, and eachbearing within its casing a fast pinion in engagement with thecorresponding. secondary gear.

In witness whereof we have signed the above application for LettersPatent at F reeport, Illinois, this 24th day of March A. D. 1914.

FREDERICK w. HoEEER. CHESTER A. HOEFER.

Witnesses:

ADELE V. LEITHNER, JULIUS NIX.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washingt0n, D. G. i

